<template>
	<div>
		<!-- 商品分类导航 -->
		<div class="type-nav">
			<div class="container" @mouseleave="leaveIndex" @mouseenter="entershow">
				<h2 class="all">全部商品分类</h2>
				<nav class="nav">
					<a href="###">服装城</a>
					<a href="###">美妆馆</a>
					<a href="###">尚品汇超市</a>
					<a href="###">全球购</a>
					<a href="###">闪购</a>
					<a href="###">团购</a>
					<a href="###">有趣</a>
					<a href="###">秒杀</a>
				</nav>
				<div class="sort" v-show="show">
					<div class="all-sort-list2" @click="goSearch">
						<div class="item" v-for='(v,index) in data' :key="v.categoryId" :class="{cur:reindex==index}">
							<h3 @mouseenter="changeIndex(index)">
								<a :data-categoryName='v.categoryName'
									:data-categoryId='v.categoryId'>{{v.categoryName}}</a>
							</h3>
							<div class="item-list clearfix" :style="{display:reindex==index?'block':'none'}">
								<div class="subitem" v-for="(v2,index)  in v.categoryChild" :key="v2.categoryId">
									<dl class="fore">
										<dt>
											<a :data-categoryName='v2.categoryName'
												:data-category2Id='v2.categoryId'>{{v2.categoryName}}</a>
										</dt>
										<dd>
											<em v-for="(v3,index)  in v2.categoryChild" :key="v3.categoryId">
												<a :data-categoryName='v3.categoryName'
													:data-category3Id='v3.categoryId'>{{v3.categoryName}}</a>
											</em>

										</dd>
									</dl>
								</div>
							</div>
						</div>
					</div>
				</div>
			</div>
		</div>
	</div>
</template>

<script>
	import {
		mapActions,
		mapState
	} from 'vuex'
	import throttle from 'lodash/throttle'
	export default {
		name: "TypeNav",
		data() {
			return {
				reindex: -1,
        show:true
			}
		},
		//组件挂载完毕：可以向服务器发请求
		methods: {
			// ...mapActions('home', {
			// 	categoryList: 'categoryList'
			// }),
			// changeIndex(index) {
			// 	this.reindex = index
			// },
			changeIndex: throttle(function(index) {
				this.reindex = index
			}, 50),
			leaveIndex() {
				this.reindex = -1
        if(this.$route.path!="/home"){
          this.show = false
        }
			},
			goSearch(event) {
				//最佳方案 编程式导航+事件委派
				//存在的问题事件委派 是把全部子节点  的事件委派给父亲节点
				//点击a标签的时候，才会进行路由跳转【怎么确定点击的是a标签】
				//存在另一个问题 如何区分a 是一级二级三级分类的标签
				//dataset属性 可以获取节点的自定义属性
				let element = event.target;
				let {
					categoryname,
					categoryid,
					category2id,
					category3id
				} = element.dataset;
				if (categoryname) {
        let location =  {name:"search"}
				let query ={categoryName:categoryname}
				if(categoryid){
					query.categoryId=categoryid
				}else if(category2id){
						query.category2Id=category2id
				}else{
						query.category3Id=category3id
				}
        if(this.$route.params){
        location.params = this.$route.params
				location.query=query
				this.$router.push(location)
				}}
			},
      entershow(){
        this.show=true;
      }
    },
		mounted() {
			// this.categoryList()
      if(this.$route.path!="/home"){
        this.show = false
      }
		},
		computed: {

			//两种
			...mapState('home', {
				data: 'categoryList'
			})
     
			// ...mapState({data:state=>state.home.categoryList})
		}
	}
</script>

<style lang="less" scoped>
	.type-nav {
		border-bottom: 2px solid #e1251b;

		.container {
			width: 1200px;
			margin: 0 auto;
			display: flex;
			position: relative;

			.all {
				width: 210px;
				height: 45px;
				background-color: #e1251b;
				line-height: 45px;
				text-align: center;
				color: #fff;
				font-size: 14px;
				font-weight: bold;
			}

			.nav {
				a {
					height: 45px;
					margin: 0 22px;
					line-height: 45px;
					font-size: 16px;
					color: #333;
				}
			}

			.sort {
				position: absolute;
				left: 0;
				top: 45px;
				width: 210px;
				height: 461px;
				position: absolute;
				background: #fafafa;
				z-index: 999;

				.all-sort-list2 {
					.cur {
						background: skyblue
					}

					.item {
						h3 {
							line-height: 30px;
							font-size: 14px;
							font-weight: 400;
							overflow: hidden;
							padding: 0 20px;
							margin: 0;

							a {
								color: #333;
							}
						}

						.item-list {
							display: none;
							position: absolute;
							width: 734px;
							min-height: 460px;
							background: #f7f7f7;
							left: 210px;
							border: 1px solid #ddd;
							top: 0;
							z-index: 9999 !important;

							.subitem {
								float: left;
								width: 650px;
								padding: 0 4px 0 8px;

								dl {
									border-top: 1px solid #eee;
									padding: 6px 0;
									overflow: hidden;
									zoom: 1;

									&.fore {
										border-top: 0;
									}

									dt {
										float: left;
										width: 54px;
										line-height: 22px;
										text-align: right;
										padding: 3px 6px 0 0;
										font-weight: 700;
									}

									dd {
										float: left;
										width: 415px;
										padding: 3px 0 0;
										overflow: hidden;

										em {
											float: left;
											height: 14px;
											line-height: 14px;
											padding: 0 8px;
											margin-top: 5px;
											border-left: 1px solid #ccc;
										}
									}
								}
							}
						}

						// &:hover {
						// 	.item-list {
						// 		display: block;
						// 	}
						// }
					}
				}
			}
		}
    .sort-enter{
      height:0px;
     }
    .sort-enter-to{
      height:461px;
    }
    .sort-enter-active{
      transition: all .5s linear;
    }
	}
</style>
